It doesn't appear as though there are alt tags on the images at the moment, perhaps the description would be useful here as that's what the alt="" attribute is intended for? Would help search engines a little, add compliancy and help accessibility.

I am not going to use the description text, though. I am going to use the title text.

The title text is more appropriate because a) it's required and it will always be there and b) the maximum length of a title field is more appropriate than a description which although can be trimmed, could then affect the context of the description.